Reckoning system using self reckoning combined with radio reckon

Details Reckoning system using self reckoning combined with radio reckon Reckoning system using self reckoning combined with radio reckon

1995-12-04

1998-04-14

Nguyen, Tan Q.

Boots, shoes, and leggings

3644492, 3644497, 36444995, 342357, 342457, 340990, G06F16500, G01C 2112

Patent

active

057400490

ABSTRACT:
A reckoning system capable of determining a current location with reliability higher than a desired level by employing both the radio reckoning and the self reckoning which compensate for each other. Vehicle-speed sensor and gyroscope provide a first provisional current location of a vehicle. A second provisional current location is provided by correcting the first provisional current location in comparison with road map information stored in a CD-ROM. A third provisional current location is obtained on the basis of information from a GPS receiver. If the second and third provisional current locations are close with each other within a predetermined distance, then the second provisional current location is selected as a conclusive current location. If not, speed and heading of the vehicle derived from the GPS receiver are compared with those derived from the vehicle-speed sensor and the gyroscope, respectively. If both matching degrees in speed and heading are high, then the third provisional current location is used to determine the conclusive current location. If at least one of the matching degrees is low, which means that the reliability of radio reckoning is degraded, then the second provisional current location is used to determine the conclusive current location.

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EPO Patent Abstract for JP6331368 (published Feb.,12, 1994).
EPO European Search Report for Application No. EP 95 11 9029.

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